Sound tube for talking machines



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w. lvjoYl-:Ry SOUND TUBE FOR TALRINQ MACHINES- originan Filfed June25,419.21'

UNITED srAT'ES'PArENT orifice,

WILIIAM- w.` MoYnR, for coLLmGswooD, NEW JERSEY, AssrGNon To VICTOR'raini-v ING 'MACHINE GOMBANY, A'conr'oanrrolv or NEW JERSEY.

SO'UND TUBE FOB. TALKING MACHINES.

` `appiicauli ined June 23, 1921, serial No.-479,738.. RenewedNovember-17,1924.

Toall whom it may concern.'

Be it known that I, WILLIAM W.,MornR,

a citizen of the United States,:ad a resi` dent of Collingswood, inthecounty of Oamden'and State of New Jersey, have invented certain new anduseful Improvements in Sound, rlubes for Talking Machines, of

Which the' following is a specification'.

My invention relates to certain improvements in talking machines, andmore; par,- ticularly to sound-tubes or sound conduits, comprising'thetone arm proper, the gooseneck or other tube to which thev sound box maybe attached, and the connection between the tone arm and the gooseneckby `means of whicha continuous passage for sound waves 1s providedbetween the sound box and abny suitable amplifier with which the tonearm may be in communication, and the sound box is free to oscillatevertically in its travel Vacross the face of the record,

and the sound box may be swung upwardly away .from the'record. Theobjects of my 'invention are to provide 'a sound conduit or soundconveying tube in which there is a substantially continuous taperingpassage Ifrom the sound i' box to the amplifier, with which the largerend of the tone armis in communication; in which there are few partswhich are'readily, and easilyfassembled; inl which the goose-- neck isfree to rotate 4smoothly in the end of the tone arm proper-withoutfrictional resistance to such motion but without any looseness betweenthe gooseneck and the tone arm; wherein any wear in the bearings betweenthe gooseneck and the tone arm may be readily taken up; in whichanyrattle'or vibration between the gooseneck and the tone Asent an.attractive appearance.

arm isabsolutely eliminated; and in whichl .the assembled tone arm andgooseneck prevthe end of the tone arm, the gooseneck, and

the connection therebetween, with the posi- 'tion of the soundboxindicated in dot and dash lines, p

In Fig.1 is shown -a portion lof a cabinet of 4a talking machine,whichportion may 'be the top of a cabinet, or a partition within- 'acabinet.v To the under sidey ofl the motor board 2, .a1-motor,V-(notshown) may be securedin the usual manner, said motor being' 'larranged. to rotate the vertical spindle 3, on f the upper 'end ofwhichthe urntable 4 is mountedtosupport and'rotate a sound record Thesound-box6 may be secured by the bayonet joint Z and pin 8, to the freeend of the'gooseneck' 9, and it" is of course provided with theusualstylus 10 arranged totrack in the grooves in the face o-f the soundrecord.r i

"The larger end of lthe tone arm "11 has a bearing `in the. bracket 13Aand a coaxial `bearing '14 inthe overhangig end 15 of the bracket 18andupon these bearings, 12 and I14, thetone'arm 11 is free to swingupon averticalaxls ina plane parallel to the face ofthe sound record 5,@ Itisto be understood that thel larger endl of the tone arm might bedirected upwardly instead of downwardly to' communicate with anampliiierabove the tone arm, a 'suitable bracket being obviously necessary for somounting theA vtone arm. Y

vWhen the stylus lOvis in engagement with the groove in the 'record 5vandthe record is rotated, the tone arm 11 and gooseneck 9 swing inahorizontal plane about the axis of the lbearings'12 and .14 andthereproduced sound is transmitted through the gooseneck 9 and tone 'arm 11to -the amplifier.

The smaller free en'd- 16 of Athe tone arm 11 is'provided lwith arelatively short transverse cylindrical. sleeve 17, 'one end 18 of whichis closed 'except for a small beveled hole 19 `therein at .the'centerthereof, and the other end of which isopen, the said open end beingprovided with an inwardly vconverging narrow beveled or conical bearingsurface 20. The sleeve 17 is permanently and rigidly secured to thesmall end 16 of the tone arm 11 Iin any substantial manner as forinstance by brazing or soldering.

The gooseneck 9 is,vgenerallyv speaking,

to by a pin 8 onthe sound box sliding into a bayonet slot 7 in the endof the gooseneck 9. The ,larger end 22 of the gooseneck 9 is preferablycylindrical and may be closed by a plug 23y rigidlyvsecured thereto, asfor instance, by brazing or soldering. Between the cylindrical end 22and the tapered por'- tion of the gooseneck or sound box tube 9 is ashoulder 24 providing a narrow conical surface 25 adapted to it smoothlyagainst the conical surface of the sleeve 17 The plug 23 is providedwith a screw threaded opening 26 arranged coaxially with respect to the-cylindrical end 22 of the gooseneck andl adapted to receive a splitscrew 27, the head 28 of which is preferably conical and adapted to fitwithin the beveled opening 19 in the closed end 18 of the sleeve 17. Theend 22 of the gooseneck 9, yand which is within the sleeve' 17, is of adiam-j eter substantially less than the kdiameter of the interior of thesaid sleeve, and the length of the said end 22 from the conical shoulder24, to the end of the plug 23 is substantially less than the length ofthe sleeve 17 froml the conical bearing 20 thereon to the inner side ofthe end wall 18 of the sleeve.

To assemble the tone arm and the gooseneck it-is merely necessary toinsert'the end 22 into the open end of the sleeve 17 `and to then threadthe screw 27 through the opening 19in the closed end 18 of the sleeve17,

into the threaded hole 26 in the plug 23 and neck up into smooth bearingrelation with the conical surface 2O of the opeir end of the sleeve 17.In this manner the two parts may be drawn so nicely together that thereisno lost motion whatever between them. 'If,..in the course of time,aslightk wear .should occur between the vconical surfaces 2O and 25 andbetween the conical head 28 of the screw 27 and the conical hole 19 inthe sleeve, it would be merely necessary to slightly turn the screw 27sufficiently to draw the parts again into perfect bearing relations withrespect to each other.

In this constructionthe bearing surfaces which are in engagement witheach other are very small. There is very little fric tional resistanceto the free turning of 'the gooseneck within the sleeve 17, but at thesametime there is no looseness or lost motion between the said parts,therebyv obviat- 'compressed and will bind tightly in the opening andremain in fixed relation `or stationary with respect to the plug whenonce' adjusted.

In the assembled relation, the gooseneck or sound box tube turns orrotates within the sleeve on` smooth narrow bearings provided by thesaid conical surfaces 2O and 25, and on the small ivot provided by thescrew or stud 27. gs shown in the drawings, the head 28 of the stud 27is pref' erably conical and fits smoothly into the 'conical hole 19 inthe closed end 18 of the sleeve 17, and therefore the gooseneck or soundbox tube may`- be considered to be mounted on a pair of opposed narrowconical bearing surfaces on the tone arm, one` of the sleeve or tone armwhich engage or are in contact at all with the gooseneck or `cooperatingconical bearing surfaces on the sleeve or tone arm. When so viewed thesound box' tube is mounted to freely rotate within the tone arm on twoopposed conical bearings adjustable axially with respect to each otherto provide for an accurate ad- -justment of the bearings and for takingup of wear therebetween.

By allowing ample clearance between the inside surface of the end 18 ofthe sleeve 17 andthe surface of the adjacent end of the-plug 23 and bymaking the diameter of .the end of the gooseneck which is inserted -intothe sleeve substantiallyless than the diameter of the interior of thesleeve, slight variations in the length or diameter of the inserted end22 of the gooseneck will not 'interfere with the proper mounting of thegooseneck within the sleeve', and therefore no particular accuracy isrequired in any of the over-all dimensions ofthe inserted end 22 ofthegooseneck or sound box tube.

the' parts mounted thereon or carried thereto draw the conical surface2,5 on the gooseby Vfhile the larger end 22 of the gooseneck is shownand described as being preferably cylindrical it is to be understoodthat it may b'e of any other suitable shape,- so long as it is out ofcontact -with the inner surface of the sleeve, except at the narrowbearing surfaces above described, and is not of 4a shape to prevent thepassage of vthe sound from the sound box to the tone-a rm proper.

Having thusl described my finvention, what I claim and desire to protectby Letters Patent of the United States is;

1. In a sound conveying tube -for talking machines, the combination of atone arm, a sound box tube mounted to rotate within the end of said arm,said tone arm being provided vwith a conical bearing surface and saidsoundbox tube being provided with 'a cooperating surface adapted to bearagainst said conical surface of said tone arm, and` means for adjustingsaid surfaces with Arespect to each other and for taking up anylooseness therebetween and vfor holding said surfaces in smooth bearingrelation. l

2. In a sound conveying tube for talking machines the combination ofatone arm and a sound box tube, theend of said sound box tube beingmounted to rotate within the end of said arm on two pairs of narrowopposed conical bearings one bearing ,of one of said pairs of bearingsbeing adjustable toward and `avi/ay from the other bearing of said pairof bearings.

3. In a sound conveying tube for talking machines the combination of atone arm lprovided with an opposed pair of narrow conicalbearing'surfaces, a sound box tube provided with a complementary pair ofopposed narrow bearing surfaces, and means to draw and adj ustfthesaidopposedesurfaces ofisaidA sound box tube toward each other, and eachrespectively against and into smooth bearing relation with one of saidconical surfaces on said tone arm,iand to securely hold said surfaces insuch adjusted position.

4. In a sound conveying tube for talking machines the combination of atone arm terminating in a sleeve and interiorly beveled at lone end toform a narrow conical bearing surface, a sound box tube having one endextending coaxially within said sleeve, said end being of a diametersubstantially less than that of 'the 'interior of said' sleeve, saidsound box tube being provided with a shoulder having a conical surface,and means, ar-y f ranged coaxially of said sleeve and said end of saidsound, box tube, secured lto said end and turning therewith, to take upwear between and to hold the said conical surfaces on 'said sleeve andsound box tube in smooth bearing engagement and providing a pivot onwhich, and said conical surfaces, said sound box tube may rotate withinsaid sleeve.

,5. In a' sound conveying tube for talking machines the combination of atone arm to lsaid end of said sound box tube and turning therewith, toadjust said sound box tube longitudinally within said sleeve and to holdthe said conical surfaces on said sleeve andt sound box tube in smoothbearing engagement andprovid-inga pivot on which, 'and' said conicalsurfaces, said soundbox tube may rotate within said sleeve.

6. In a sound conveying tube for talking machines, the combination of atone arm, terminating in a cylindrical sleeve open at one endandsubstantially closed at the other, but provided'with a relatively smallopening at the center of the closed end thereof, the open end of saidsleeve being interiorly beveled to form -a narrow conical bearingsurface, a sound box tube having one'end mounted within' said sleevewithA its innerl end spaced from the closed end of said sleeve and of adiameter substantially less than that ofthe interior fof said sleeve,and hav- 7. In a sound conveying tube for talking j machines, a tone armterminating in a trans- -verse cylindrical end open at one end and'substantially closed at the other end but provided with a 'relativelysmall opening at the centeriof the closed end thereof, the open 4end ofsaid sleeve being interiorly beveled to forma narrow conical bearingsurface, a gooseneck having one end extending coaxiallywithin saidsleeve, said end of said gooseneck being of a diameter substantiallyless than that of the interior of said sleeve and of a lengthsubstantially less than that of said sleeve, said' gooseneck beingprovided with a shoulder having a conical surface, and means arrangedcoaxially of said sleeve and said end of said gooseneck, passing'vthrough said small opening in the end4 of said sleeve, tightly securedto said gooseneck, turning therewith, operative to hold cal surfaces,said gooseneck rotates Withinl said sleeve.

8. In a sound conveying tube for talking machines, the combination of atone arm and a sound box tube mounted to rotate Within the end of saidarm, said tone arm and saidsound box tube being each provided With aconical bearing surface 'adapted to' t one against the other, and meansfor adjusting' said sound box tube longitudinally With- 10 inthe end ofsaid arm and for holding said conical surfaces in smooth bearingrelation. lIn Witness whereof, I have hereunto set iny hand this 21stday o`June, 1921.

WlLLIAM W. MOYER.

